# A rocket moving vertically -- Find the cosmonaut's weight

1. Dec 6, 2017

### inv4lid

1. The problem statement, all variables and given/known data
A rocket during launch from the Earth's surface moves vertically with an acceleration of 22m / s ^ 2. Find the cosmonaut's weight inside the cabin if his mass is 90kg.

2. Relevant equations
The problem belongs to "Elasticity. Moving under the action of elastic force" chapter.
General gravity relating to man = 900N;
N - G = ma?
N = m(a+g)
N = 90*(22+10) = 2880 N

3. The attempt at a solution
No idea currently, trying to solve

Last edited: Dec 6, 2017
2. Dec 6, 2017

### PeroK

What the definition of weight?

3. Dec 6, 2017

### Orodruin

Staff Emeritus
What do you mean ”no idea”? You essentially solved it.

4. Dec 6, 2017

### inv4lid

Just got it, ty anyway

5. Dec 6, 2017

### PeroK

There's solving a problem and knowing you've solved it!

6. Dec 6, 2017

### Orodruin

Staff Emeritus
I think the two are the same (as long as you got it right). Hence the addition of the ”essentially” - the remaining step being to realise that what was computed was the sought quantity.